Improvement in machines for threading bolts



am site HENRYMARTIN, or LOUISVILLE, KENTUCKY.

Letters Patent No. 113,072, dated March 28, 1871;

IMPROVEMENT INMACHINES *FOR THREADING BOLTS.

The Schedule referred to in these Letters Patent and making part of the sme.

To all whom it may concern:

Be it known that I, HENRY MARTIN, of'Louisl ville, in the county of Jefferson and State of Kena full, clear, and exact description thereof, reference being had to the accompanying drawing making part of this specification, in which- Figure 1, plate 1, is an elevation of one side ofthe improved machine. Y

Figures 2 and 3 are views, partly in section, of the engaging and disengaging-clutches for stopping the rotation of the spindles at the moment the threads have been cnt of the required length.

Figure 4, plate 2, isa topview of the machine.

Figure 5, plate 2, isa top view of the threadingdies and oil-basin. Figures 6, 7, and 8, plate' 3, show the devices for holding and adjusting the threaded dies.

Figures 9, 10, and 11, plate 4,- are views showing a modification of the clutching device of figs.'2 and 3.

Similar letters of reference indicate corresponding parts in the several Iigures.

' Before describing this invention, I will state that the bolts are confined to their spindles during the threading operation by means of bolt-holders J, .which are constructed precisely as I have described and claimed theml in an application for Letters Patentfor boltthreading machinery, which is marked case A, and which bears even date with the filing of this applicatiou; I d o not, therefore, claim under this application v:said bolt-holders.

In theaccompanyingdrawing A represents an upright'post, which should be firmly sustained in its upright position, and which has rigidly secured to one side a horizontal oil-basin, in which the threading dies are arranged.

, Above this oil-basin are three horizontal brackets, B B B',- the lower twoof which receivethrough them four Vertical spindles, c c c c, which are allowed to receive rotary and vertical motions.

- Each spindle c is suspended froma vertically-vibrating' arm g3, 'by means 'of a hooked rod, g2, and a swivel-stirrup, g1.

The arm 930 each spindle@ is connected to a handlever, g5, by means of a rod, g.

The hand-lever g? of each spindle c ispiroted to a bar, x, and lies alongside of a toothed segment, S, the 'teeth on which will arrest and hold down the hand-Iever gf when the spindle connectedto such' lever is raised. v

On the lower'end of each spindle c'a device, J, is applied for receiving, centering, and holding the bolts during the operation of cutting threads on them. l

A shaft, a, passes horizontally through the post A, and carries on one end cone-pulleys a, over which a driving-belt passes. Y

On the opposite end of theshaft a a bevel-spur wheel is keyed, the teeth of whiohcngage with the teeth of a bevel-spur wheel, b, whichis keyed on a vertical shaft, b1', that is lheldand guidedby the bracketsB'B.

0n the lower end of the shaft bla spur-wheel, b?, is

keyed just above the upper one of bracketsB. This..

spur-wheel bz engages with the teeth of fourspurwheels c', which rest on the' upper one ,of brackets B, and through which the spindles c pass` loosely. By this arrangement the four spur-wheels c' will rotate whenthe driving-shaft a s rotated.

The upper end ofthe hub f each wheel cis toothed, so as to form a clutchingfend,e, and above such clltching-end is a corresponding but reversed clutchingfface, e', which isA formed on the lower end of a stem, P, which has vertical shoulders, g, formed ou its periphery above an annularrecess, f. This stem P isloosely v applied on its spindle c, and is received into the'lower end of a thimble, h, which is made fast to the spindle by a setscrew, 1 1/,and which, by loosening this screw,

can be adjusted up or down on its spindle c;

By means of one or more screws z', which pass through-the thimble hand abut against'the shoulders g on the stem P, the latter is caused to turnl with its spindle.

The shoulders g terminate below the upper end of the stem P, so that,'when the spindle c is raised, as shown in' iigslaud 2,- so as to iree'a bolt from its threading-dies, the stem P will also .be raised, and in this Way it can be sustained free from the clutchingface e on the'wheel c'. When, however, the spindle c is depressed, the stem P will rest upon the clutchingface of the wheel e', and thcclutches e e' will be eugaged, as shown in fig-3. l

, Now, when the spur-wheels c'are rotated, they will communicate rotary motion to their respective spindles through the inediunrof the shoulders g on clutchvstems P, screws z', thilnbles h, and setscrews h. This rotary motion ofthe spindles will continueduring the descent of'the spindles and threading of theI bolts; but at the moment the required length of thread is produced the rpins 'i on the 'thimbles hf will leave. the shoulders g, and be received into the 'annular recesses f in' stems P, 'and the further rotation ot' the spindles `will cease.

The length of threads to be cutis determined by adjusting the thimbles 0n their respectivespindles, i

higher or lower.

Instead of employing the thimbles and the clutches, as above'described, a simpler plan may be adopted for effecting the same object, which I will describe here after.

The basin C, which isv arranged beneath the boltholders J ,is adapted to contain oil and also the screwcutting dies. There are four pairs of these threadingdies, corresponding to the four spindles above described; and, as all the Adies are constructed and operated alike, I will describe but one pair.

The die-pieces EF, which are straight-sided, are fitted into expansible jaws E E, and are adjustable endwise by means ot' the setscrews l l.

The pivoted pieces k k cross the dies F F and keep them down in their places, and also allow the` removal of the dies at pleasure.'

' The jaws E E are connected to a base-plate, D, by

` vertical pivots j j, which are sustained against lateral strain by the cross-brace j'.

The tree ends n n ot' the ekpansible jaws E E are reduced, passed beneath a T-head, lm, and received into slots o o, which are made into the periphery of an oscillating drum, G.

This drinn is supported by bearings G G', and to its extending shaft sz a hand-lever, s, is attached, by vibrating which the dies and theirjaws will be moved further apart or nearer to one another.

It will he seen that the movements of the die-jaws are elected by making the slots o o oblique, as shown l in fig. 8.

The hand-lever s1 rises alongside of a notched plate or rack, s, which is supported by a standard above the oil-basin G. This plate or racks may be adjustable when great nicety of adjustment is required for bolts of different diameters.

0n plate 4 I have represented the modification of `Jthe spindle-clutch above described. The spindle c has a hub, N, secured to it, from which wings w w extend. This spindle is free to move up and down while it is rotating.

The spur-wheel c -is held'downu'pon bracket B by means oi' a collar, q, and from the top side of this wheel, diametrically opposite each other, standards t Y t rise vertically, having feathers y y formed upon their inner sides. These feathers do not extend entirely .to the surface of wheel c; consequently spaces f f are left between the .lower ends of the feathers and the wheel c'.

The hub N should be adjustable on the spindle-c, for adjusting the device to different lengths of threads. It will be seen that, during the operation of threadiiig a bolt, the spindle carrying such bolt will be slowly drawn 'downward while it is rotated, carrying with it the feathered hub N, and that this gradual descent and rotation of the spindle will continue until the wings 'w w pass below the feathers y y, when the spindle will instantly cease its rotation -and descent.

By adjusting the hub N up or down on its spindle the amount of descent of this spindle can be regulated; consequently different lengths of threads on bolts can be produced in my machine at the same time or at dierent times.

Instead of' adopting. the precise construction of clutching and unclutching devices described and shown, it is obvious that thedivided device e e' f P y may consist of a single piece fastened rmly to wheel c', in which case the shoulder g, sleeve h, and spindle c may require to be increased in length somewhat, and said shoulders will terminate at the top of the part P, so as to allow the pin i to rise above the shoulder when it is desired to raise the spindle for the withdrawal of the screw-threaded bolts.

I am aware that Joseph R. Brown, in his patent for an improvement in screw-cutting machines, dated November 28, 1865, makes use of a reversible clutch, which operates automatically, but in a manner and by means of contrivances essentially different from mme.

My clutch is not reversible. Its purpose is not only different, but the instrnmentalities employed are substantially different from his. I claim `nothing which is described or shown in his patent.

Iam also aware Caleb B. Walworth, in his patent of February 17,1857, has shown some of the con trivances employed by me. I make no claim to such 4 contrivauces by themselves.

One feature of my invention consists in the contrivance by which I avoid the necessity of a feed-screw to give and preserve the proper pitch to the screwthreads to be cut. My experience has shown that, by constructing the machinery as described in my application, and of the ordinary weight, and then so arranging it that it may stand in a vertical position, so that the bolt may be fed freely downward by the action of gravity operating in conjunction with the cutting-dies by which the screws are formed on those bolts, the necessity of any other -feed-motion will be wholly dispensed with. Greatervsimplicity of co'nstruction will be thereby obtained, and much lessexpensive machinery will suice to produce results equally as beneficial as those obtained by feed-screws for that purpose.

Another feature of my inveution consists in avoiding the `necessity of giving a reverse motion to the bolt in order to discharge it after the screw-thread has been cut upon it, which is done in the manner hereinbefore shown. This also enables me to dispense with some of the machinery that would otherwise be necessary, and secures cheapness of construction and economy of time without lessening the eiciency of the machine.

The advantage of .this arrangement is that the machine can run a number of spindles'carrying bolts of dilierent lengths or bolts of the same length, ou which threads of thel same length or of different lengths can be cut, eachspindle being independent in v its operation of therother's, andeach spindle automat-V ically stopping at the moment a given length of thread is produced. Y

Having described my invention, l What I claim as new, and desire to secure by Letters Patent, is-

. 1. In a holt-threading machine, in which the bolt is held in a vertical position while being threaded, the stop fi, fixed for the time being in an unchangeable relation to the shaft c, which carries the'bolt to be threaded, and the shouldel' g, (which forms a part of the device that is attached to or that may be made to interlock with the gear c', for thepurpose of transmitting themotive power of the machine to the said shaft 0,) in combination with a screw-cutting and feeding-die so constructed that it can readily be opened to release the bolt after the cutting of the thread thereon is completed, the whole being so constructed, arranged and adj usted that when the threading of the bolt is completed the said stop shall pass .clear 'of said shoulder into the open space beyond, so that thelbolt shall cease to revolve, all substantially as and for the purpose described. l

In a bolt-threading machine such as is above of the operator, substantially as described.

and made to terminate automatically at the pleasre' 3. 'The jaws E E un, pivots jj, screw-cutting dies F F, cylinder G o o s, and bed D, constructed, arranged, and operating in the manner described.

4. The combination of tbe adjusting devices l l, the adjusting devices s s,'dies F F, jaws E E, cylinder G o 'a s, and bed D, constructed and -arranged and operating `as described.

5. The within-described clutching andunclutching device or its equivalent, whether used inthe cutting of yonly one length of screw-thread or dii'erent lengths of screw-threads, combined with the sliding and rotary spindle c of ebelt-threading lmachine placed in a vertical position, and with a screw-cutting and feeding-die made to close and open around the bolt which is being threaded, substantially-as described. v

, HENRY MARTIN.

Witnesses r H. GIESERVEEZEN, v GEORGE NEEB. 

